Greater London · London and the South East
Roof leak investigation in Northwood, Greater London
Wondering about the leaking roof at a property in Northwood? You can book a roof leak investigation in Northwood and across Greater London, with plain-English findings.
- A leak that comes and goes with the weather
- Stains around a skylight
- Brown rings on upstairs ceilings
Roof leak investigation in Northwood: what you get
Older homes have more places for water to get in. Lead flashings crack or lift, valley linings wear and parapet gutters overflow when outlets block. A central valley gutter on a butterfly roof frequently turns out to be the source in heavy rain. We check parapets, valleys and flashings from each safe vantage point. The findings are recorded with photos. If you’ve noticed staining around the chimney inside and damp underlay across a wide area, a survey will tell you what’s going on.
In a London flat, water can travel some way before it shows, sometimes in a different flat from the one below the defect. Tracing it back matters, both for dealing with the cause and for any insurance claim. We look at what we are given access to in Northwood, inside and out. Tell us when the water shows, and in what kind of weather.
After the visit, you get a report with photos, emailed to you. It sets out the condition of the leaking roof, any defects and our written recommendations.
- Where
- Northwood (HA6)
- Wider area
- Greater London
- Prices
- From £150 inc. VAT
- Your report
- A written report with photos, by email
- Appointments
- Weekdays, Saturdays and Sundays
- Insurance
- Professional indemnity and public liability
- Call
- 07833 053749
- Updated
- 27 October 2026
Tips that help
Small things make a difference, both for the survey and for the roof itself. Some pointers:
- Note the weather when the leak shows
- Protect furniture and flooring under the leak
- Let us know what has already been tried
- Photograph the stain each time it appears
Any roofer you ask to quote can work from the report. They’ll see exactly where the problem is, rather than at the stain.
After a downpour, look in the roof space with a torch, keeping to boarded areas. Look for drips, damp patches and stains on timbers. Photograph anything new.
Can I check my roof myself?
You can learn a lot from ground level. With binoculars, look for slipped or missing slates and tiles, gaps along the ridge and leaning chimneys. Never climb onto the roof to look.
During heavy rain, look at the gutters from the ground or a window. Overflowing water can point to a blockage or a sagging run.
Landlord and commercial surveys in Northwood
We also survey roofs for businesses and commercial landlords, including offices, shops and units. Larger roofs take longer.
Any of our surveys can be booked by landlords, agents and building managers in Northwood. To discuss a property or a block, ring 07833 053749 or use the contact form.
What we do, step by step
We do not take risks to get a closer look. We inspect whatever is safely visible, and anything we cannot see is noted in the report. Most visits take between one and two hours at a typical home; commercial roofs usually need 3–4 hours. In a London area like Northwood, the main things to sort out are parking and access: tell us about permits, visitor bays or off-street space, which floor the property is on and how to get into the loft. On the day, the roof is looked at from the ground, from windows, from inside the roof space and from the roof where it is safe.
- You let us know where the water appears, when, and what the weather was doing.
- Inside, we look at the stain and the ceiling around it.
- In the loft, we follow any signs of water back towards the roof.
- Outside, we check flashings, valleys, chimneys, gutters and flat roof details from each safe vantage point.
- We email a written report showing where the water most likely gets in.
How to prepare
- Mention any parking restrictions on your street
- Show us where any leaks or stains appear
- If it is not your property yet, arrange access through the agent
How to book
To arrange a survey, ring 07833 053749 or email us and tell us the address and what’s prompted the survey. We’ll confirm the price before you book.
Related advice
Northwood questions
Is parking a problem for a survey in Northwood?
Parking in Northwood, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
How do I find out if my home in Northwood is listed?
You can check whether a building is listed on Historic England’s list, and your council can tell you if it is in a conservation area. If a home is listed, changes that affect its special interest need listed building consent, and in a conservation area re-roofing in different materials may need permission.
Can you survey a shared roof?
Yes, as long as access is agreed. The roof of a block or converted house is often shared, so the freeholder or managing agent needs to agree access. We inspect only the parts we are allowed to reach.
How experienced are you?
Over 20 years and more than 5,000 surveys, across London and South East England.
Is Northwood in your area?
Yes, we do. Northwood is part of the area we cover, and the service is the same as everywhere else we work.
Why is not the leak directly above the stain?
Water follows the easiest path, not the shortest. On a flat roof it can travel under the covering before it finds a way through the ceiling. Following that route is what our investigation does.
Do I have to be there for the survey?
That depends on the survey. Inside the building and in the loft, we need someone to let us in; we’ll agree the details as you book.
Roof by roof
Parapet and box gutters
Some older terraces have a butterfly roof with a valley gutter in the middle. If that gutter or its outlet fails, water can come through the top-floor ceiling.
Lead flashings
Water from a failed flashing can travel down the wall or along a rafter. We check every flashing that could feed the stain.
What we’re asked to look at in Northwood
A roof valley collects the rain from two slopes. Worn lead, cracked linings or a build-up of leaves and moss can push water under the slates or tiles. The stain may appear well away from the valley itself.
Things that often lead to a survey include:
- Water coming in around a roof light or dormer
- Damp on a chimney breast
- Water through the ceiling under a flat roof
- Water marks that spread in wet weather
If you own a rental within reach of Carpenders Park station, a tenant living with a leak needs the cause found, not just the stain painted over.
Before you book any roof surveyor
- What insurance they carry
- How long they’ve been surveying roofs
- Whether the inside of the roof is included
- Do they have a CAA Flyer ID and Operator ID for drone work?
Nearby places to Northwood
Also in Northwood
Northwood roofs and the weather
With Headstone Manor about 3.3 miles south-east, Northwood sits in an area with a long building history. Period homes nearby can have lead valleys, tall chimneys and a patchwork of past repairs, and any change of roofing material on a listed home needs checking with the council first. In outer London, interwar semis with hipped, tiled roofs sit alongside older slate-roofed terraces. Bay roofs, hip ridges and dormers from later loft conversions are the details that set these houses apart. Knowing the roof type helps narrow down where water may be getting in.
If you look after a building like Frithwood Primary School, a leak through a large roof is often found some distance from where the water shows inside. Trees in and around King George V Playing Fields shed leaves that can end up in nearby gutters.
Northwood is about 3 miles south-east of Rickmansworth, in Greater London. Whether the building in Northwood is a house, a flat or a commercial unit, we can survey the roof. Northwood is one of the towns and villages in Greater London we cover for roof leak investigations. You can also see our page for London.
Here we cover the HA6 postcode area for roof leak investigations. We cover properties on Little Stream Close and Sandy Lodge Way and the roads around them. We also cover Eastbury (1 mile north-east), Moor Park (1 mile north-west), Batchworth Heath (1 mile west), Batchworth (2 miles north-west) and Holywell (2 miles north). Further out, we also cover City of Westminster (14 miles south-east), Marylebone (14 miles south-east), Kensington (12 miles south-east), St Pancras (14 miles south-east), Hampstead (11 miles south-east) and Ruislip (3 miles south).
Landmarks near Northwood
Typical jobs here are in homes near King George V Playing Fields, The Gate Public House and London School of Theology, among other places. The nearest railway station is Carpenders Park station, roughly 1.7 miles north-east. Nearby you will also find Harlequin Centre (2.9 miles north-east) and Heath Robinson Museum (2.2 miles south-east). The countryside around Northwood includes Dews Farm Sand Pits and Tumbling Bay.